#15164: Slowdown in ghc compile times from GHC 8.0.2 to GHC 8.2.1 when doing Called arity analysis -------------------------------------+------------------------------------- Reporter: flip101 | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): Which module in particular is showing the slow down? Does the problem go away if you `derive` less classes (in particular, `Data`)? (Unlikely, your data types are not big, but still worth checking.) Does the problem go away with `-fno-call-arity`? (Using this flag might be a suitable work-around for you to continue with your actual program.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15164#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler